For this kuva weapon I decided to go for a toxic progenitor because I can get viral with just one mod.

With 978k DPS when [Galvanized Diffusion] and the Primary Merciless arcane are built up, this build can delete anything in it's path.

However even if you don't have them, use regular Split Chamber (same for Bane of Grineer and Cryo Rounds instead of the primed ones) and you'll be able to one-shot level 160 Heavy Gunners, or if you're unlucky with the slashes, a second shot should be more than enough to melt them away. For those who are interested, the DPS with these easier-to-get mods is a strong 194k. Also, with these versions of mods you can get away with one less forma.

PS: the DPS numbers you're seeing are if you have a 60% [Kuva Bramma]. I am easily doing Steel Path with a 26% [Kuva Bramma], which is basically almost the weakest possible [Kuva Bramma] (for those who don't know the percentage you get is between 25% and 60%).